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What is a multi-jackbolt tensioner?

A "Superbolt" or "multi-jackbolt tensioner (MJT)" is a direct replacement for hex nuts, covered
nuts, bolts, etc. They spin onto your existing bolt or stud and provide a better way to bolt up your joint. They
consist of three components, shown above.

Superbolt multi-jackbolt tensioners (MJTs) replace existing hex nuts. Only hand tools are required for installation and removal of any size
tensioner. Safe, accurate and economical! We have a wide range of standard series, as well as an unlimited capacity to create special designs
to meet your unique needs.

Bolt style Superbolt multi-jackbolt tensioners (MJTs) replace existing studs or bolts. Ideal for applications with tapped holes, or where
threading a stud into a nut would be impractical. The outside diameter is smaller than a nut type tensioner on a stud, allowing MJTs to fit
into tighter areas.

Flexnuts are used in combination with Superbolt tensioners and are designed to flex out at the bottom and flex in toward the top of the nut.
This distributes the bolt load along many threads, adds elasticity, and prevents stress concentrations in the first few threads.